Add self as a contributor

Author: smallsaucepan

packages/turf-boolean-crosses/package.json

@@ -5,7 +5,8 @@
   "author": "Turf Authors",
   "contributors": [
     "Rowan Winsemius <@rowanwins>",
-    "Denis Carriere <@DenisCarriere>"
+    "Denis Carriere <@DenisCarriere>",
+    "James Beard <@smallsaucepan>"
   ],
   "license": "MIT",
   "bugs": {